<template>
  <el-select :value="valueTitle" :clearable="clearable" :placeholder="placeholder" :disabled="disabled" @clear="clearHandle">
    <el-option :value="valueTitle" :label="valueTitle">
      <el-tree
        ref="selectTree"
        :accordion="accordion"
        :data="options"
        :props="props"
        :node-key="props.value"
        :default-expanded-keys="defaultExpandedKey"
        @node-click="handleNodeClick">
      </el-tree>
    </el-option>
  </el-select>
</template>

<script>
export default {
  name: 'el-tree-select',
  props: {
    /* 配置项 */
    props: {
      type: Object,
      default: () => {
        return {
          value: 'id', // ID字段名
          label: 'name', // 显示名称
          children: 'children' // 子级字段名
        }
      }
    },
    /* 选项列表数据 */
    options: {
      type: Array, // 必须是树形结构的对象数组
      default: () => {
        return []
      }
    },
    /* 值 */
    value: {
      type: String,
      default: () => {
        return null
      }
    },
    /* 可清空选项 */
    clearable: {
      type: Boolean,
      default: () => {
        return true
      }
    },
    /* 自动收起 */
    accordion: {
      type: Boolean,
      default: () => { return false }
    },
    disabled: {
      type: Boolean,
      default: () => { return false }
    },
    placeholder: {
      type: String,
      default: () => {
        return '请选择'
      }
    }
  },
  data () {
    return {
      valueId: this.value, // 初始值
      valueTitle: '',
      defaultExpandedKey: []
    }
  },
  mounted () {
    this.initHandle()
  },
  methods: {
    // 初始化值
    initHandle () {
      if (this.valueId) {
        this.valueTitle = this.$refs.selectTree.getNode(this.valueId).data.name // 初始化显示
        this.$refs.selectTree.setCurrentKey(this.valueId) // 设置默认选中
        this.defaultExpandedKey = [this.valueId] // 设置默认展开
      } else {
        this.valueId = ''
        this.valueTitle = ''
      }
    },
    // 切换选项
    handleNodeClick (node) {
      this.valueTitle = node[this.props.label]
      this.valueId = node[this.props.value]
      this.$emit('getValue', this.valueId)
      this.defaultExpandedKey = []
    },
    // 清除选中
    clearHandle () {
      this.valueTitle = ''
      this.valueId = null
      this.defaultExpandedKey = []
      this.$refs.selectTree.setCurrentKey(null) // 设置默认选中
      this.$emit('getValue', null)
    }
  },
  watch: {
    value () {
      this.valueId = this.value
      this.initHandle()
    }
  }
}
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
  .el-scrollbar .el-scrollbar__view .el-select-dropdown__item{
    height: auto;
    padding: 0;
  }
  .el-tree{
    /*background-color: #000;*/
  }
  .el-select-dropdown__item{
    /*background-color: #000;*/
  }
  .el-select-dropdown__item.selected{
    font-weight: normal;
  }
  ul li >>>.el-tree .el-tree-node__content{
    height:auto;
  }
  ul li >>>.el-tree .el-tree-node__content:hover{
    /*background-color: #0089af;*/
    background-color: #32f1ff16;
  }
  .el-tree-node__label{
    font-weight: normal;
  }
  .el-tree >>>.is-current .el-tree-node__label{
    /*color: #409EFF;*/
    font-weight: 700;
  }
  .el-tree >>>.is-current .el-tree-node__children .el-tree-node__label{
    /*color:#606266;*/
    font-weight: normal;
  }
</style>
